How to use CC_MD5 method in swift language

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This is what I came up with. It’s an extension to String.
Don’t forget to add #import <CommonCrypto/CommonCrypto.h> to the ObjC-Swift bridging header that Xcode creates.

extension String  {
    var md5: String! {
        let str = self.cStringUsingEncoding(NSUTF8StringEncoding)
        let strLen = CC_LONG(self.lengthOfBytesUsingEncoding(NSUTF8StringEncoding))
        let digestLen = Int(CC_MD5_DIGEST_LENGTH)
        let result = UnsafeMutablePointer<CUnsignedChar>.alloc(digestLen)

        CC_MD5(str!, strLen, result)

        let hash = NSMutableString()
        for i in 0..<digestLen {
            hash.appendFormat("%02x", result[i])
        }

        result.dealloc(digestLen)

        return String(format: hash as String)
    }
 }

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